The carb flange has no markings on it. The box it came in is labeled "B11069". The tractor came to me with a 7-horse non-cub kohler scabbed into it. The motor came with the tractor as a rebuildable core. I only know it's a K301 because I measured the bore and stroke...
Here's a pic of the carb mouth; you can clearly see the holes at 3 and 9 are bigger than the 10-32's at 4/8/12:
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